Why wattage, what we care about is current!

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crxess

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Op,
Your point seems to be a bit pointless as most vapors do adapt to a preferred resistance, or resistances on differing RTA/rda's.

All this is for the - it must be, electronics specialist, not the general vaping public. Must are still sorting out the basics of ohms law after several years of vaping...............
or like me, have picked up reliable meters, found good calculating programs, and moved to Regulated mods.
Simplification, not confusion.;)


Nope, for what we care about is a good vape:D (j/k)
 

Magaro

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Edited to add supr quickly demonstrated my argument wrong. Still feel free to read it though (there's a puppy at the end).


Long/ranty/mathy, but come along for the ride if you've got a few.

TLDR at the end

First the math:

(1) V=IR (Voltage = Current X Resistance)

(2) Wattage = VI (Voltage X Current)

So as a result

(3) W=I^2R

(4) I = Square root(W/R)


So a couple of points:

The current is the description of the energy delivered to vaporize the ejuice, and thus the vapor production/vapor heat.

Wattage is a description of the electrical work performed by the battery. It is not the energy delivered by the device. That's the current.

Take equation (3). You run a VW device at a high wattage , but a very high resistance. That's could actually be a really low vapor production/ cool vape, because your current would be small. So your doing tons of electrical work (using battery life), but not producing much current, and therefore not producing much vapor, and relatively cool vapor.

Wattage is often used as a stand in for "coolness" of vapor or the vapor production, but that really isn't necessarily true. It's only true for a constant resistance.

As a way of describing your battery capability wattage is useful, as a way of describing your vaping experience, it has to be referenced with resistance, so when people talk about wattage they are really referencing current without knowing it (or at least without explicitly referencing it)

Why does this matter:

Lets say I'm running an RDA at 1.3 ohms and 14 watts and enjoying the vapor production/throat hit/temperature (in fact, I am). What I should be doing is identifying the current associated with those specs using equation (4). I should then be using the current I discovered works for me, and dropping the resistance significantly down towards the bottom of what my mod can handle. Then, using equation (3), I can input my current which I've determined I like, the lowest resistance (or near lowest, because as coils heat up their resistance drops) that my mod can handle, and get the wattage I want to set my VW mod to. It will be significantly lower than the 14 watts described above, because, I dropped the resistance as low as I safely could. Now I'm running my desired current at a lower wattage, so I'm producing the vapor that I want while draining my battery less, because as I mentioned above wattage just tells you how fast your're draining your battery (the work being performed). You're gaining nothing by running at higher resistance than the lowest resistance (or near lowest) your mod is capable of on a variable wattage device other than draining your battery faster.

A weakness in this analysis is that dropping the resistance would require a coil build that would vary from my current build (thinner coil inner diameter, larger gauge, less coils), but for the purposes of the post I'm assuming that people aren't intensely attached to the particulars of their coil build like gauge, inner diameter, and number of coils.


TLDR: Wattage tells us how much were sapping our battery. Current tells us how much energy we're delivering to our wicked coils, thus producing vapor. Why don't we as vapors talk more about the current we're vaping at? It's the energy delivered to our ejuice, and thus the vapor produced/vapor temp.

If you made it this far, here's a puppy for your troubles. Thoughts?


3f5f837a50a5b899bcb74707bb693ad8.jpg

What really matters is the temperature of the surface of the coil, the surface area of the coil, the delivery of e-liquid to the coil by the wick, and airflow over the coil/wick. Sadly, this isn't something that can be simply "computed" using Ohm's Law. Vaping is far more complex than you represent it as.
 

yuseffuhler

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What really matters is the temperature of the surface of the coil, the surface area of the coil, the delivery of e-liquid to the coil by the wick, and airflow over the coil/wick. Sadly, this isn't something that can be simply "computed" using Ohm's Law. Vaping is far more complex than you represent it as.
Of all the numbers thrown around, heat flux is not mentioned anywhere near as much as it should be. It's the single biggest factor in my builds. Wicking is probably the most difficult part to get right for me btw.
 

Cullin Kin

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Of all the numbers thrown around, heat flux is not mentioned anywhere near as much as it should be. It's the single biggest factor in my builds. Wicking is probably the most difficult part to get right for me btw.

This. Heat flux is absolutely essential. I became much happier with my vape once I understood this.
 
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yuseffuhler

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This. Heat flux is absolutely essential. I became much happier with my vape once I understood this.
It took me a while to find it because I was so concentrated on the resistance (as low as my mod would handle). I didn't have the best vape, and alternately had dry hits or flooded as I tried to figure out what I was doing wrong.
 
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Froth

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This. Heat flux is absolutely essential. I became much happier with my vape once I understood this.
Almost every vaper that I've talked to looks at me like I'm making stuff up when I mention building to a certain heat flux number. Patiently waiting for the "What heat flux mW/mm² do you vape at?" thread so I can feel like I'm part of the cool kids once everyone else learns about it.
 

denali_41

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VW become popular because of the reason [set at XX amount of watts and no matter what you put on it your experience will be the same making VW superior ] what a crock !!

then factor in china starting coming out very affordable VW mods and VW took over the market

now the big hyped thing is temperature control,,jeeesh whats next
 
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Cullin Kin

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Almost every vaper that I've talked to looks at me like I'm making stuff up when I mention building to a certain heat flux number. Patiently waiting for the "What heat flux mW/mm² do you vape at?" thread so I can feel like I'm part of the cool kids once everyone else learns about it.

I would be a regular in that thread! Start it and I'll join the convo. :)
 

crxess

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Reality check

The Cool kids may have it all figured out with Heat Flux and Voltage only mods..........But most of the millions of vapors seem to be doing fine while ignoring Both.

People arguing VV/VW ultimately use W I D E resistances as example of how it can't be any good. Problem is most Vapors fine their resistance comfort zone and it gets narrower with time.
Both VV and VW Get you there, they just take different routes.
Therefor a Vapor enjoying several Kayfuns within a few tenths of an ohm of each other will likely never notice a change in the vape when switching on a VW mod.
Even a wider resistance change still places the mods output much closer to preferred output than a VV application. Then it is usually a very small adjustment to sweeten the vape.

Those that will not study will not learn.

I learn, then forget, then have to learn again. But I keep trying.
 

puddinman

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Does it really matter what you adjust, in the big picture view? When you adjust W, the computer is adjusting V and A based on the resistance, no? Since it's all interconnected, I can't see what difference it would actually make if we could adjust Amps.

Admittedly, I am not mathematically inclined and maybe I'm missing the point of the discussion -but I'm always willing to learn.
 

suprtrkr

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Almost every vaper that I've talked to looks at me like I'm making stuff up when I mention building to a certain heat flux number. Patiently waiting for the "What heat flux mW/mm² do you vape at?" thread so I can feel like I'm part of the cool kids once everyone else learns about it.
I have only recently begun calculating my builds to heat flux. When you start you thread, I'll be joining.
 
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herb

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I've thrown all these names and numbers on the fire and settled for a binary system where a vape is either OK or not OK.


Ha ha ha , with you 100% on that , sure some like to make it sound a lot more technical than it needs to be but it really comes down to does it vape well or not vape well .
 
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